Subtract 56/49 from 30/70, Solve 30/70

Subtract 56/49 from 30/70

1^st number: 30/70, 2^nd number: 1 7/49

30/70 - 56/49 is -5/7.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 49 is 490

Next, find the equivalent fraction of both fractional numbers with denominator 490
For the 1st fraction, since 70 × 7 = 490,
30/70 = 30 × 7/70 × 7 = 210/490
Likewise, for the 2nd fraction, since 49 × 10 = 490,
56/49 = 56 × 10/49 × 10 = 560/490
Subtract the two like fractions:
210/490 - 560/490 = 210 - 560/490 = -350/490
After reducing the fraction, the answer is -5/7

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